difference between progressive rendering and non progressive

[pegaze]

hello, what is the difference between a progressive rendering and a non-progressive in terms of quality and speed?

[kenancakir]

If your graphic card is good, use progressive render, you can see the resault at the beginning so you can stop it to make needed changes or wait until it finishes and it is final render.. If your cpu is better than gpu use bucket render..

[pegaze]

ok, thanks !!

[GD3DESIGN]

Well, that's not entirely accurate information there.....uuuhhhh, I'd have to just say it's inaccurate.

CPU vs GPU use entirely different render engines....one is written to run on CPU's and one is in CUDA. In fact, in 3DS Max you actually switch renderers to switch between Vray Advanced (CPU) & Vray GPU. Progressive runs on CPU or GPU, as does Bucket rendering, they are image sampling methods. In the asset editor, the first choice in render settings is the render engine: CPU or GPU, then you can select Interactive or not, and then you can choose either bucket or progressive sampling for each. Progressive is best used for setting up your scene, so you can see changes immediately without waiting for the buckets to render - it has really sped up workflows in recent years....and works just as well whether rendering on CPU or GPU. Immediate feedback so you can tweak materials, etc, quickly see results, keep tweaking, rinse, repeat. Bucket rendering is more efficient and overall faster for a complete render, so it's advisable to switch to Bucket for your final render. I should note that I have not tested and compared render times myself, this is what I've been told by Chaos Group, so that's what I go with. Though, everyone has their own workflow and sometimes when you are in a rush it might be advantageous to let a Progressive render run until it is 'good enough' and roll with it. It's always advisable to do a few tests with your system to see how your hardware performs. Compare a small render using the different settings. If one method renders in 45 seconds and another in 1:25, then you know you could save some good time on a large render. But again, bucket/progressive are independent of CPU/GPU. One is the image sampling method and the latter are two separate render engines.

Below is a good tutorial by Chaos Group explaining modern vray image sampling, the 2nd half of it they get into progressive vs bucket stuff------->
https://www.youtube.com/watch?v=oAiUy4in7Zo


Also, here is a good thread where Lele lays out a pros&cons chart for Bucket vs. Progressive samplers:
https://forums.chaosgroup.com/forum/...plers-analysis

Cheers!
GD

[Micha]

At Rhino, and I suppose so we use nearly the same V-Ray software, I found, that the progressive GPU is approx. at half speed running only. I get full GPU power in bucket mode only. Maybe the speed difference is caused by a bug or a hardware limit. I'm curious - can this speed issue observed at SU too?